Epson PhotoPC 850Z, Service Manual, Page: 59 / 127

EPSON PhotoPC 850Z Revision A
Troubleshooting Trouble Shooting 59
3.2.2 No Shooting
3.2.3 Image Cannot be Taken
6
Check 80-pin (XIN) oscillation
of IC301.
NO Check X3001.
7
Check 82-pin (XCIN)
oscillation of IC301.
NO
Check X3002, R3004,
C3001, and C3002.
8 Check IC301. -- --
Table 3-3. No Shooting
Checking
Order
Check Point Judgement Solution
1 Press the shutter button. -- --
2
Check 7-pin (SCAN IN 3)
pulse input of IC301.
NO
Check POWER
SWITCH, CN301,
Q3005, Q3006, R3024.
3
Check 7-pin or 8-pin (/PON,
/P(A) ON) pulse input of
CN301.
LOW
Check IC301, Q3005,
Q3006, and PW1.
4
Is 6-pin, 12-pin, or 13-pin of
CN301 HIGH?
NO
Check IC301, PW1, and
CA2.
5
Is the serial communication
normal?
NG Check IC301 and CA2.
6 Check CA2. -- --
Table 3-2. Check points when the camera has no power
Checking
Order
Check Point Judgement Solution
Table 3-4. Image Cannot be Taken
Checking
Order
Check Point Judgement Solution
1
Is the system drive clock
(72MHz) input to 280-pin
(CLK IN1) of IC102?
YES Check X1101 and IC111.
2
Is CLK (36MHz) input to 132-
pin (CLK IN) of IC101?
NO Check 278-pin of IC102.
3 Check 61-pin (ZAS) of IC101. NG
Check the address with
IC121 and data bus.
4
Check 52-pin (ZBREQ) of
IC101.
NG Check ASIC
5
Check 56-pin (ZBGRNT) of
IC101.
NG Check ASIC.
6
Check the signal of 118-pin
and 119-pin (IRL1, 2) of
IC101.
NG
8-bit microprocessor and
HAND SHAKE of RS-
232C are defective.
7
Check CPU and soldering for
the memory, etc.
-- --